CN113481418A - Nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy and preparation method thereof - Google Patents
Nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy which is NiAl- (Mo) according to atomic percentagexCrxVxFex)4x(x is more than or equal to 9 and less than or equal to 11), wherein Ni and Al are in equal atomic ratio; the invention also discloses a preparation method of the eutectic system high-entropy alloy, which comprises the steps of weighing the raw materials according to the atomic ratio, pretreating the surfaces of the raw materials, and putting the raw materials into an electric arc melting furnace for melting to obtain the nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic system high-entropy alloy.
Description
Technical Field
The invention belongs to the technical field of eutectic high-entropy alloys, relates to a nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy, and further relates to a preparation method of the eutectic high-entropy alloy.
Background
The NiAl intermetallic compound has the advantages of low density (5.86g/cm3), high thermal conductivity (70-80W/m.k), high melting point (1638 ℃), excellent oxidation resistance and the like in aviationThe material has wide application prospect in the fields of motivation and the like, and is considered to be the next generation of ideal high-temperature structural material. However, its room temperature brittleness (4-6 MPa. m)1/2) And the low high-temperature strength limits the application of the high-temperature-resistant composite material in the fields of aviation and the like.
The introduction of the second phase by alloying is one of the main methods for improving the performance of the NiAl, for example, the single addition of Mo, Cr, V, Fe, Nb, Ta, W and other elements to NiAl forms NiAl-Mo, NiAl-Cr, NiAl-V, NiAl-Fe, NiAl-Nb, NiAl-Ta and NiAl-W two-phase eutectic alloys respectively, and the simultaneous addition of two elements, for example, the addition of Cr/Mo, Cr/Ta and the like forms NiAl-Cr (Mo) two-phase eutectic or NiAl-Cr-Ta three-phase eutectic, but both of them have difficulty in possessing higher toughness and strength.
Disclosure of Invention
The invention aims to provide a nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy, which solves the problem that an NiAl intermetallic compound in the prior art cannot have higher toughness and strength at the same time.
The invention also aims to provide a preparation method of the eutectic high-entropy alloy.
The technical scheme adopted by the invention is that the nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy is NiAl- (Mo) according to atomic percentagexCrxVxFex)4xX is more than or equal to 9 and less than or equal to 11, wherein the Ni and the Al are in equal atomic ratio.
The invention adopts another technical scheme that a preparation method of the nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy is implemented according to the following steps:
step 1, according to NiAl- (Mo)xCrxVxFex)4xRespectively weighing Ni blocks, Al rods, Cr sheets, Mo wires, V blocks and Fe rods with x being more than or equal to 9 and less than or equal to 11 in atomic percent, wherein the Ni and the Al are in equal atomic ratio, and calculating the compensation amount of the Al, and the mass compensation of the Al is 1 wt%;
step 2, pretreating the surfaces of the Ni block, the Al rod, the Mo wire and the Fe rod weighed in the step 1;
and 3, sequentially placing the Ni blocks, the Al rods, the Cr sheets, the Mo wires, the V blocks and the Fe rods processed in the step 2 into a water-cooled copper crucible according to the melting points from bottom to top, and then placing the water-cooled copper crucible into an electric arc melting furnace for melting to obtain the nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic alloy.
The other technical scheme of the invention is also characterized in that:
the purity of the Ni block, the Al rod, the Cr sheet, the Mo wire, the V block and the Fe rod weighed in the step 1 is not less than 99.9%.
Step 2, specifically, grinding the Ni blocks and the Fe blocks by using a grinding machine, and then finely grinding by using 80# to 1000# abrasive paper to remove oxide skins; and (3) finely grinding the Al block and the Mo wire by using 80# to 1000# sandpaper to remove oxide skin, and ultrasonically cleaning for 15-30 min.
The smelting in the step 3 is implemented according to the following steps:
step 3.1, firstly, the working cavity of the arc melting furnace is vacuumized to 6.9 multiplied by 10-3Pa～6.0×10-3Pa, introducing high-purity argon with the purity of 99.99 percent as protective gas, and stopping inflating when the pressure in the furnace reaches-0.06 to-0.05 MPa;
step 3.2, carrying out primary smelting;
step 3.3, carrying out secondary smelting;
and 3.4, repeating the step 3.3 for 3-5 times to obtain the nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy.
And 3.2 specifically, firstly smelting the Ni block, the Al rod, the Cr sheet, the Mo wire, the V block and the Fe rod at the smelting current of 560-600A for 1-2min, then starting magnetic stirring at the stirring current of 6-8A for 4-5 min, and finally cooling the metal liquid to a solid state to obtain the primarily smelted alloy ingot.
And 3.3, specifically, overturning the primarily smelted alloy ingot by using a manipulator, carrying out secondary smelting at a smelting current of 560-600A for 1-2min, starting magnetic stirring at a stirring current of 6-8A for 4-5 min, and cooling the molten metal to be solid to obtain the secondarily smelted alloy ingot.
The invention has the beneficial effects that: the NiAl-MoCrVFe eutectic system high-entropy alloy structure prepared by the invention comprises a hypoeutectic alloy structure, an eutectic alloy structure and a hypereutectic alloy structure, wherein the hypoeutectic alloy consists of a primary NiAl phase and an eutectic two phase (a NiAl phase and a MoCrVFe high-entropy phase); the eutectic alloy is a full eutectic lamellar structure and consists of a NiAl phase and a MoCrVFe high-entropy phase; the hypereutectic alloy consists of a primary MoCrVFe high-entropy phase and a eutectic two-phase (a NiAl phase and the MoCrVFe high-entropy phase); the two-phase eutectic high-entropy alloy structure can obtain better comprehensive performance by absorbing the advantages of two phases due to the alternate two-phase eutectic, particularly, Mo, Cr, V and Fe in the high-entropy phase have good toughening effect on NiAl, and the high-entropy phase has high strength, so that the strengthening and toughening effect of the high-entropy phase in the two-phase eutectic can enable the NiAl-MoCrVFe eutectic high-entropy alloy to have high strength and toughness.
Drawings
FIG. 1a shows NiAl- (Mo) as an Ni-Al-Mo-Cr-V-Fe eutectic high-entropy alloy prepared in example 19Cr9V9Fe9)36(at.%) a low-power microstructure map of a hypoeutectic high entropy alloy;
FIG. 1b shows NiAl- (Mo) as an Ni-Al-Mo-Cr-V-Fe eutectic high-entropy alloy9Cr9V9Fe9)36(at.%) a high-power microstructure map of a hypoeutectic high entropy alloy;
FIG. 2a shows NiAl- (Mo) as an Ni-Al-Mo-Cr-V-Fe eutectic high-entropy alloy prepared in example 29.5Cr9.5V9.5Fe9.5)38(at.%) a low-power microstructure map of a hypoeutectic high entropy alloy;
FIG. 2b shows NiAl- (Mo) as an Ni-Al-Mo-Cr-V-Fe eutectic high-entropy alloy9.5Cr9.5V9.5Fe9.5)38(at.%) a high-power microstructure map of a hypoeutectic high entropy alloy;
FIG. 3a shows NiAl- (Mo) as an Ni-Al-Mo-Cr-V-Fe eutectic high-entropy alloy10Cr10V10Fe10)40(at.%) a low-power microstructure map of the eutectic high-entropy alloy;
FIG. 3b shows NiAl- (Mo) as an Ni-Al-Mo-Cr-V-Fe eutectic high-entropy alloy10Cr10V10Fe10)40(at.%) high-power microstructure map of eutectic high-entropy alloy;
FIG. 4a shows NiAl- (Mo) as an Ni-Al-Mo-Cr-V-Fe eutectic high-entropy alloy10.5Cr10.5V10.5Fe10.5)42(at.%) a low-power microstructure map of a hypereutectic high entropy alloy;
FIG. 4b shows NiAl- (Mo) as an Ni-Al-Mo-Cr-V-Fe eutectic high-entropy alloy10.5Cr10.5V10.5Fe10.5)42(at.%) a high-power microstructure map of a hypereutectic high entropy alloy;
FIG. 5a shows NiAl- (Mo) as an Ni-Al-Mo-Cr-V-Fe eutectic high-entropy alloy prepared in example 5 of the present invention11Cr11V11Fe11)44(at.%) a low-power microstructure map of a hypereutectic high entropy alloy;
FIG. 5b shows NiAl- (Mo) as an Ni-Al-Mo-Cr-V-Fe eutectic high-entropy alloy11Cr11V11Fe11)44(at.%) high-power microstructure of hypereutectic high entropy alloys.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The invention relates to a nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy which is NiAl- (Mo) according to atomic percentagexCrxVxFex)4x(x is more than or equal to 9 and less than or equal to 11), wherein the Ni and the Al are in equal atomic ratio.
The invention relates to a preparation method of a nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy, which is implemented according to the following steps:
step 1, according to NiAl- (Mo)xCrxVxFex)4x(x is more than or equal to 9 and less than or equal to 11) respectively weighing Ni blocks, Al rods, Cr sheets, Mo wires, V blocks and Fe rods, wherein the purities of the Ni blocks, the Al rods, the Cr sheets, the Mo wires, the V blocks and the Fe rods are not less than 99.9 percent, the Ni and the Al are in equal atomic ratio, the compensation amount of the Al is calculated, and the mass compensation of the Al is 1 wt%;
step 2, pretreating the surfaces of the Ni block, the Al rod, the Mo wire and the Fe rod weighed in the step 1, specifically, polishing the Ni block and the Fe block by using a grinding machine, and then finely polishing by using 80# to 1000# abrasive paper to remove oxide skin; carrying out fine grinding on the Al block and the Mo wire by using No. 80-1000 abrasive paper to remove oxide skin, and carrying out ultrasonic cleaning for 15-30 min;
and 3, sequentially placing the Ni blocks, the Al rods, the Cr sheets, the Mo wires, the V blocks and the Fe rods processed in the step 2 into a water-cooled copper crucible from bottom to top according to the melting points, and then placing the copper crucible into an electric arc melting furnace for melting to obtain the nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy, wherein the method is implemented according to the following steps:
step 3.1, firstly, the working cavity of the arc melting furnace is vacuumized to 6.9 multiplied by 10-3Pa～6.0×10-3Pa, introducing high-purity argon with the purity of 99.99 percent as protective gas, and stopping inflating when the pressure in the furnace reaches-0.06 to-0.05 MPa;
step 3.2, carrying out primary smelting, specifically, smelting Ni blocks, Al rods, Cr sheets, Mo wires, V blocks and Fe rods at a smelting current of 560-600A, after raw material mixtures such as 1-2min of smelting are completely melted, starting magnetic stirring at a stirring current of 6-8A for 4-5 min, and finally cooling the metal liquid to a solid state to obtain an alloy ingot subjected to primary smelting;
3.3, performing secondary smelting, specifically, turning over the primarily smelted alloy ingot by using a manipulator, performing secondary smelting, wherein the smelting current is 560-600A, after the raw material mixture is completely melted after smelting for 1-2min, and the like, starting magnetic stirring, the stirring current is 6-8A, the stirring time is 4-5 min, and obtaining the secondarily smelted alloy ingot after the molten metal is cooled to be solid;
and 3.4, repeating the step 3.3 for 3-5 times to obtain the nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy.
Example 1
A preparation method of a nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy is implemented according to the following steps:
step 1, weighing raw materials according to NiAl- (Mo)9Cr9V9Fe9)36Respectively weighing Ni blocks, Al rods, Cr sheets, Mo wires, V blocks and Fe rods (the purity of the used metal raw materials is more than 99.9%), wherein the Ni and the Al are in equal atomic ratio, and calculating the compensation amount of the Al, and the mass compensation of the Al is 1 wt%;
step 2, processing the raw materials used in the step 1, polishing the Ni blocks and the Fe blocks by using a grinder, and finely polishing by using No. 80 abrasive paper to remove oxide skins; carrying out fine polishing on the Al block and the Mo wire by using No. 80 abrasive paper to remove oxide skin, and carrying out ultrasonic cleaning for 15 min;
step 3, smelting the master alloy to prepare NiAl- (Mo)9Cr9V9Fe9)36The hypoeutectic high-entropy alloy comprises the following specific steps:
step 3.1, placing the metal treated in the step 2 into a water-cooled copper crucible, sequentially placing the metal from low melting point to high melting point from bottom to top, and firstly vacuumizing a working cavity of an electric arc melting furnace to 6.9 multiplied by 10-3Pa, introducing high-purity argon with the purity of 99.99 percent as protective gas, stopping filling gas when the pressure in the furnace reaches-0.06 MPa, melting pure titanium in the furnace, and reducing the oxygen content in the vacuum furnace through the molten titanium;
step 3.2, firstly smelting the raw material mixture in the furnace, wherein the smelting current is 560A, after the raw material mixture is completely melted after 1min of smelting, starting magnetic stirring, the stirring current is 8A, keeping for 5min, stopping smelting after the mixture is completely melted, and cooling the metal liquid to a solid state to obtain an alloy ingot which is smelted for the first time;
step 3.3, turning over the primarily smelted alloy ingot through a manipulator, then starting smelting, wherein the smelting current is 560A, after the raw material mixture is completely melted after smelting for 1min, starting magnetic stirring, the stirring current is 8A, keeping for 5min, and cooling the molten metal to be solid to obtain the alloy ingot;
and 3.4, repeating the step 3.3 for three times to prevent component segregation, and finally obtaining the nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy.
FIG. 1 shows NiAl- (Mo) prepared in example 19Cr9V9Fe9)36High entropy sumAnd (b) as shown in fig. 1(b), the two phases of the eutectic lamina are a black NiAl phase and a white MoCrVFe high-entropy phase, wherein the strengthening and toughening effects of the MoCrVFe high-entropy phase enable the alloy to have high strength and toughness. In addition, the black primary NiAl phase is present in the alloy structure, and the hypoeutectic composition thereof is illustrated as shown in fig. 1(a), and belongs to hypoeutectic alloys.
Example 2
A preparation method of a nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy is implemented according to the following steps:
step 1, weighing raw materials according to NiAl- (Mo)9.5Cr9.5V9.5Fe9.5)38Respectively weighing Ni blocks, Al rods, Cr sheets, Mo wires, V blocks and Fe rods (the purity of the used metal raw materials is more than 99.9 percent) in atomic percent, wherein the Ni and the Al are in equal atomic ratio, and calculating the compensation amount of the Al, and the mass compensation of the Al is 1 wt%;
step 2, processing the raw materials weighed in the step 1, polishing the Ni blocks and the Fe blocks by using a grinder, and then finely polishing by using No. 200 abrasive paper to remove oxide skins; carrying out fine polishing on the Al block and the Mo wire by using No. 200 sand paper to remove oxide skin, and carrying out ultrasonic cleaning for 20 min;
step 3, smelting the master alloy to prepare NiAl- (Mo)9.5Cr9.5V9.5Fe9.5)38(at.%) hypoeutectic high entropy alloy, the concrete method is:
step 3.1, placing the metal treated in the step 2 into a water-cooled copper crucible, placing the metal in sequence from low melting point to high melting point from bottom to top, and firstly vacuumizing a working cavity of an electric arc melting furnace to 6.5 multiplied by 10-3Pa, introducing high-purity argon with the purity of 99.99 percent as protective gas, stopping filling gas when the pressure in the furnace reaches-0.06 MPa, melting pure titanium in the furnace, and reducing the oxygen content in the vacuum furnace through the molten titanium;
step 3.2, firstly smelting the raw material mixture in the furnace, wherein the smelting current is 570A, after the raw material mixture is completely melted after 1min of smelting, starting magnetic stirring, the stirring current is 7.5A, keeping for 5min, stopping smelting after the mixture is completely melted, and cooling the metal liquid to a solid state to obtain an alloy ingot which is smelted for the first time;
step 3.3, turning over the primarily smelted alloy ingot through a manipulator, then starting smelting, wherein the smelting current is 570A, starting magnetic stirring after raw material mixtures are completely melted after smelting for 1min and the like, the stirring current is 7.5A, and keeping for 5min, and obtaining the alloy ingot after the molten metal is cooled to be solid;
and 3.4, repeating the step 3.3 for three times to prevent component segregation, and finally obtaining the nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy.
FIG. 2 shows NiAl- (Mo) prepared in example 29.5Cr9.5V9.5Fe9.5)38(at.%) microstructure of the high entropy alloy, with a cellular eutectic lamellar structure, as shown in fig. 2 (b). The eutectic two phases are a black NiAl phase and a white MoCrVFe high-entropy phase, wherein the strengthening and toughening effects of the MoCrVFe high-entropy phase enable the alloy to have high strength and toughness. The black primary NiAl phase still present in the alloy structure is a hypoeutectic alloy, as shown in FIG. 2(a), and the hypoeutectic composition is illustrated.
Example 3
A preparation method of a nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy is implemented according to the following steps:
step 1, weighing raw materials according to NiAl- (Mo)10Cr10V10Fe10)40Respectively weighing Ni blocks, Al rods, Cr sheets, Mo wires, V blocks and Fe rods (the purity of the used metal raw materials is more than 99.9 percent) in atomic percent, wherein the Ni and the Al are in equal atomic ratio, and calculating the compensation amount of the Al, and the mass compensation of the Al is 1 wt%;
step 2, processing the raw materials weighed in the step 1, polishing the Ni blocks and the Fe blocks by using a grinder, and then finely polishing by using No. 600 abrasive paper to remove oxide skins; carrying out fine polishing on the Al block and the Mo wire by using No. 600 abrasive paper to remove oxide skin, and carrying out ultrasonic cleaning for 25 min;
step 3, smelting the master alloy to prepare NiAl- (Mo)10Cr10V10Fe10)40(at.%) eutecticThe specific method of the high-entropy alloy comprises the following steps:
step 3.1, placing the metal treated in the step 2 into a water-cooled copper crucible, placing the metal in sequence from low melting point to high melting point from bottom to top, and firstly vacuumizing a working cavity of an electric arc melting furnace to 6.0 multiplied by 10-3Pa, introducing high-purity argon with the purity of 99.99 percent as protective gas, stopping filling gas when the pressure in the furnace reaches-0.05 MPa, melting pure titanium in the furnace, and reducing the oxygen content in the vacuum furnace through the molten titanium;
step 3.2, firstly, smelting the raw material mixture in the furnace, wherein the smelting current is 580A, the smelting is carried out for 1.5min, and the like, after the raw material mixture is completely molten, starting magnetic stirring, the stirring current is 7A, keeping for 4.5min, stopping smelting after the mixture is completely molten, and cooling the metal liquid to a solid state to obtain an alloy ingot which is subjected to primary smelting;
step 3.3, turning over the primarily smelted alloy ingot through a manipulator, then starting smelting, wherein the smelting current is 580A, after the raw material mixture is completely melted after 1.5min of smelting and the like, starting magnetic stirring, the stirring current is 7A, and keeping for 4.5min, and after the molten metal is cooled to be solid, obtaining the alloy ingot;
and 3.4, repeating the step 3.3 for four times to prevent component segregation, and finally obtaining the nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy.
FIG. 3 shows NiAl- (Mo) prepared in example 310Cr10V10Fe10)40(at.%) microstructure of the high entropy alloy. The macroscopic photograph shows that there is no primary phase in the alloy structure, as shown in fig. 3 (a); the high magnification photograph shows that the alloy structure is a cellular full eutectic lamellar structure, the two eutectic phases are a black NiAl phase and a white MoCrVFe high-entropy phase, and as shown in figure 3(b), the strengthening and toughening effects of the MoCrVFe high-entropy phase enable the alloy to have high strength and toughness.
Example 4
A preparation method of a nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy is implemented according to the following steps:
step 1, weighing raw materials according to NiAl- (Mo)10.5Cr10.5V10.5Fe10.5)42Respectively weighing Ni blocks, Al rods, Cr sheets, Mo wires, V blocks and Fe rods (the purity of the used metal raw materials is more than 99.9 percent) in atomic percent, wherein the Ni and the Al are in equal atomic ratio, and calculating the compensation amount of the Al, and the mass compensation of the Al is 1 wt%;
step 2, processing the raw materials weighed in the step 1, polishing the Ni blocks and the Fe blocks by using a grinder, and then finely polishing by using No. 1000 abrasive paper to remove oxide skins; carrying out fine polishing on the Al block and the Mo wire by using No. 1000 abrasive paper to remove oxide skin, and carrying out ultrasonic cleaning for 30 min;
step 3, smelting the master alloy to prepare NiAl- (Mo)10.5Cr10.5V10.5Fe10.5)42(at.%) hypereutectic high entropy alloy, the concrete method is:
step 3.1, placing the metal treated in the step 2 into a water-cooled copper crucible, placing the metal in sequence from low melting point to high melting point from bottom to top, and firstly vacuumizing a working cavity of an electric arc melting furnace to 6.5 multiplied by 10-3Pa, introducing high-purity argon with the purity of 99.99 percent as protective gas, stopping filling gas when the pressure in the furnace reaches-0.55 MPa, melting pure titanium in the furnace, and reducing the oxygen content in the vacuum furnace through the molten titanium;
step 3.2, firstly smelting the raw material mixture in the furnace, wherein the smelting current is 590A, starting magnetic stirring after the raw material mixture is completely molten, the stirring current is 6.5A, keeping for 4.5min, smelting for 2min, and the like, and cooling the molten metal to be solid to obtain an alloy ingot which is smelted for the first time;
step 3.3, turning over the primarily smelted alloy ingot through a manipulator, then starting smelting, wherein the smelting current is 590A, after the raw material mixture is completely melted after smelting for 2min and the like, starting magnetic stirring, wherein the stirring current is 6.5A, and keeping for 4.5min, and obtaining the alloy ingot after the molten metal is cooled to be solid;
and 3.4, repeating the step 3.3 five times to prevent component segregation, and finally obtaining the nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy.
FIG. 4 shows NiAl- (Mo) prepared in example 410.5Cr10.5V10.5Fe10.5)42(at.%) microstructure of the high entropy alloy, with cellular eutectic lamellar structure, as shown in fig. 4(b), the eutectic two phases are a black NiAl phase and a white MoCrVFe high entropy phase, where the toughening of the MoCrVFe high entropy phase will give the alloy high strength and toughness. In addition, white primary MoCrVFe high entropy phase also exists in the alloy structure, as shown in FIG. 4(a), the hypereutectic composition is illustrated, and the hypereutectic alloy belongs to.
Example 5
A preparation method of a nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy is implemented according to the following steps:
step 1, weighing raw materials according to NiAl- (Mo)11Cr11V11Fe11)44Respectively weighing Ni blocks, Al rods, Cr sheets, Mo wires, V blocks and Fe rods (the purity of the used metal raw materials is more than 99.9 percent) in atomic percent, wherein the Ni and the Al are in equal atomic ratio, and calculating the compensation amount of the Al, and the mass compensation of the Al is 1 wt%;
step 2, processing the raw materials weighed in the step 1, polishing the Ni blocks and the Fe blocks by using a grinder, and then finely polishing by using No. 1000 abrasive paper to remove oxide skins; carrying out fine polishing on the Al block and the Mo wire by using No. 1000 abrasive paper to remove oxide skin, and carrying out ultrasonic cleaning for 30 min;
step 3, smelting the master alloy to prepare NiAl- (Mo)11Cr11V11Fe11)44(at.%) hypereutectic high entropy alloy, the concrete method is:
step 3.1, placing the metal treated in the step 2 into a water-cooled copper crucible, placing the metal in sequence from low melting point to high melting point from bottom to top, and firstly vacuumizing a working cavity of an electric arc melting furnace to 6.0 multiplied by 10-3Pa, introducing high-purity argon with the purity of 99.99 percent as protective gas, stopping filling gas when the pressure in the furnace reaches-0.05 MPa, melting pure titanium in the furnace, and reducing the oxygen content in the vacuum furnace through the molten titanium;
step 3.2, firstly smelting the raw material mixture in the furnace, starting magnetic stirring after the raw material mixture is completely melted, keeping the stirring current at 6A for 4min, stopping smelting after the mixture is completely melted, and cooling the metal liquid to a solid state to obtain an alloy ingot which is smelted for the first time;
step 3.3, turning over the primarily smelted alloy ingot through a manipulator, then starting smelting, wherein the smelting current is 600A, starting magnetic stirring after the raw material mixture is completely melted after smelting for 2min and the like, the stirring current is 6A, and keeping for 4min, and obtaining the alloy ingot after the molten metal is cooled to be solid;
and 3.4, repeating the step 3.3 five times to prevent component segregation, and finally obtaining the nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy.
FIG. 5 shows NiAl- (Mo) prepared in example 511Cr11V11Fe11)44(at.%) microstructure of the high entropy alloy, with cellular eutectic lamellar structure, as shown in fig. 5(b), the eutectic two phases are a black NiAl phase and a white MoCrVFe high entropy phase, where the toughening of the MoCrVFe high entropy phase will give the alloy high strength and toughness. In addition, white primary mocrffe high entropy phase exists in the alloy structure, and as shown in fig. 5(a), hypereutectic composition is illustrated, and the hypereutectic composition belongs to hypoeutectic.
Claims (7)
1. A high-entropy alloy of Ni-Al-Mo-Cr-V-Fe eutectic system is characterized by comprising NiAl- (Mo) in atomic percentagexCrxVxFex)4xX is more than or equal to 9 and less than or equal to 11, wherein the Ni and the Al are in equal atomic ratio.
2. A preparation method of a nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy is characterized by comprising the following steps:
step 1, according to NiAl- (Mo)xCrxVxFex)4xRespectively weighing Ni blocks, Al rods, Cr sheets, Mo wires, V blocks and Fe rods with x being more than or equal to 9 and less than or equal to 11 in atomic percent, wherein the Ni and the Al are in equal atomic ratio, and calculating the compensation amount of the Al, and the mass compensation of the Al is 1 wt%;
step 2, pretreating the surfaces of the Ni block, the Al rod, the Mo wire and the Fe rod weighed in the step 1;
and 3, sequentially placing the Ni blocks, the Al rods, the Cr sheets, the Mo wires, the V blocks and the Fe rods processed in the step 2 into a water-cooled copper crucible according to the melting points from bottom to top, and then placing the water-cooled copper crucible into an electric arc melting furnace for melting to obtain the nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic alloy.
3. The method for preparing the Ni-Al-Mo-Cr-V-Fe eutectic high-entropy alloy as claimed in claim 2, wherein the purity of the Ni blocks, the Al rods, the Cr sheets, the Mo wires, the V blocks and the Fe rods weighed in the step 1 is not less than 99.9%.
4. The method for preparing the nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy as claimed in claim 2, wherein the step 2 is to polish the Ni block and the Fe block by using a grinder, and then to remove oxide skin by fine polishing with 80# to 1000# sandpaper; and (3) finely grinding the Al block and the Mo wire by using 80# to 1000# sandpaper to remove oxide skin, and ultrasonically cleaning for 15-30 min.
5. The method for preparing the nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy as claimed in claim 2, wherein the smelting in the step 3 is specifically carried out according to the following steps:
step 3.1, firstly, the working cavity of the arc melting furnace is vacuumized to 6.9 multiplied by 10-3Pa～6.0×10-3Pa, introducing high-purity argon with the purity of 99.99 percent as protective gas, and stopping inflating when the pressure in the furnace reaches-0.06 to-0.05 MPa;
step 3.2, carrying out primary smelting;
step 3.3, carrying out secondary smelting;
and 3.4, repeating the step 3.3 for 3-5 times to obtain the nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy.
6. The preparation method of the nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy as claimed in claim 5, wherein the step 3.2 is specifically that a Ni block, an Al rod, a Cr sheet, a Mo wire, a V block and an Fe rod are smelted firstly, the smelting current is 560-600A, the smelting time is 1-2min, then magnetic stirring is started, the stirring current is 6-8A, the stirring time is 4-5 min, and finally the molten metal is cooled to a solid state to obtain an alloy ingot which is smelted for the first time.
7. The preparation method of the nickel-aluminum-molybdenum-chromium-vanadium-iron eutectic high-entropy alloy as claimed in claim 5, wherein the step 3.3 is specifically that a manipulator is used for overturning the primarily smelted alloy ingot for secondary smelting, the smelting current is 560-600A, the smelting time is 1-2min, then magnetic stirring is started, the stirring current is 6-8A, the stirring time is 4-5 min, and the alloy ingot for secondary smelting is obtained after the molten metal is cooled to be solid.
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